The present disclosure relates to a technique for radio link monitoring in a wireless communication system, and to operation procedures of the base station and user equipment and a method for radio link quality evaluation on the basis of the technique. In the method, the user equipment divides the downlink channel bandwidth into multiple frequency ranges, measures channel states for each frequency range, and evaluates the radio link quality based on channel state measurement results. Thereafter, the user equipment sends frequency range quality information to the base station, which may then utilize the same for downlink resource allocation. Hence, it is possible to solve the problem of the existing scheme wherein the user equipment enters the physical layer problem detection state or the radio link failure state although a frequency range usable for service provisioning is present within the downlink channel bandwidth.
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1. A method of radio link monitoring for a user equipment in a wireless communication system, the method comprising: receiving configuration information for dividing a downlink channel bandwidth into multiple frequency ranges from a corresponding base station; dividing the downlink channel bandwidth into the multiple frequency ranges for radio link monitoring; measuring channel states for each frequency range; and evaluating a radio link quality to in-sync or out-of-sync on the basis of channel state measurement results, wherein the evaluating of the radio link quality comprises evaluating, if channel state measurement results for all of the frequency ranges are less than a first reference value, the radio link quality to out-of-sync, and wherein a radio link failure is determined based on the evaluated radio link quality.
A user equipment (UE) monitors radio link quality by dividing the downlink channel bandwidth into multiple frequency ranges. The UE receives configuration information from the base station specifying how to divide the bandwidth. For each frequency range, the UE measures channel state. The radio link quality is determined to be "out-of-sync" if the channel state measurement results for all frequency ranges are below a first threshold. Radio link failure is determined based on the evaluated radio link quality (in-sync or out-of-sync).
2. The method of claim 1 , wherein the evaluating of the radio link quality comprises evaluating, if at least one of the frequency ranges produces a channel state measurement result for at least one of the frequency ranges is greater than a second reference value, the radio link quality to in-sync.
The radio link monitoring method from the previous description evaluates the radio link quality to "in-sync" if the channel state measurement result for at least one frequency range is above a second threshold. This provides a way to ensure the radio link is considered acceptable even if some frequency ranges have poor channel quality.
3. The method of claim 1 , further comprising sending quality information for the individual frequency ranges to the corresponding base station.
The radio link monitoring method from the previous descriptions further includes sending quality information for each frequency range to the base station. This allows the base station to be informed about the channel quality of individual frequency ranges, enabling it to make informed decisions about resource allocation and other link management procedures.
4. The method of claim 3 , wherein the sending of the quality information comprises: sending an uplink resource allocation request or a random access preamble to the base station; and sending the quality information for the individual frequency ranges to the base station through uplink resources allocated by the base station in response to the uplink resource allocation request or random access preamble.
The method of sending quality information for individual frequency ranges to the base station involves first sending an uplink resource allocation request (or random access preamble). After the base station allocates uplink resources in response, the UE sends the frequency range quality information using those allocated resources.
5. The method of claim 1 , wherein the measuring of the channel states comprises measuring channel states for each frequency range by use of a reference signal sent by the corresponding base station.
The method of measuring channel states for each frequency range uses a reference signal transmitted by the base station. The UE analyzes the reference signal within each frequency range to determine the channel state for that range.
6. The method of claim 5 , wherein the reference signal is a channel state information reference signal (CSI-RS) or a common reference signal.
The reference signal used to measure channel states within each frequency range is either a channel state information reference signal (CSI-RS) or a common reference signal. These signals are specifically designed for channel estimation and quality measurement.
7. The method of claim 1 , wherein the configuration information comprises information on at least one of sizes of frequency ranges, a number of frequency ranges, or positions in frequencies of frequency ranges.
The configuration information received from the base station, specifying how to divide the downlink channel bandwidth, includes information about at least one of the following: the size of the frequency ranges, the number of frequency ranges, or the frequency positions of each range. This allows the base station to dynamically configure the frequency ranges used for radio link monitoring.
8. A user equipment conducting radio link monitoring in a wireless communication system, comprising: a transceiver configured to send and receive signals to and from a base station; at least one processor configured to: receive configuration information for dividing a downlink channel bandwidth into multiple frequency ranges from the base station, divide the downlink channel bandwidth into the multiple frequency ranges for radio link monitoring, measure channel states for each frequency range, and evaluate a radio link quality to in-sync or out-of-sync on the basis of channel state measurement results, wherein the radio link quality is evaluated to out-of-sync if channel state measurement results for all the frequency ranges are less than a first reference value, and wherein a radio link failure is determined based on the evaluated radio link quality.
A user equipment (UE) for radio link monitoring includes a transceiver for communication and a processor. The processor receives configuration information from the base station specifying how to divide the downlink channel bandwidth into multiple frequency ranges. The processor divides the bandwidth accordingly, measures channel state for each frequency range, and evaluates radio link quality as either "in-sync" or "out-of-sync". The radio link quality is "out-of-sync" if the channel state measurements for all frequency ranges are below a first threshold. Radio link failure is determined based on this quality evaluation.
9. The user equipment of claim 8 , wherein the radio link quality is evaluated to in-sync if a channel state measurement result for at least one of the frequency ranges is greater than a second reference value.
In the radio link monitoring UE from the previous description, the processor evaluates the radio link quality to "in-sync" if the channel state measurement for at least one of the frequency ranges is above a second reference value. This provides a way to maintain the link if some, but not all, frequency ranges are of sufficient quality.
10. The user equipment of claim 8 , wherein the at least one processor is further configured to control transmission of quality information for the individual frequency ranges to the base station.
In the radio link monitoring UE from the previous descriptions, the processor further controls the transmission of quality information for each frequency range to the base station. This allows the base station to know the specific channel conditions of each frequency range as measured by the UE.
11. The user equipment of claim 10 , wherein the at least one processor is further configured to: control a process of sending an uplink resource allocation request or a random access preamble to the base station, and send the quality information for the individual frequency ranges to the base station through uplink resources allocated by the base station in response to the uplink resource allocation request or random access preamble.
In the radio link monitoring UE from the previous descriptions, the processor controls a process to send an uplink resource allocation request (or a random access preamble) to the base station. It then sends the frequency range quality information to the base station using the uplink resources allocated in response to that request or preamble.
12. The user equipment of claim 8 , wherein the at least one processor is further configured to measure channel states for each frequency range by use of a reference signal sent by the station.
In the radio link monitoring UE from the previous descriptions, the processor measures channel states for each frequency range using a reference signal sent by the base station. The UE analyzes the reference signal to estimate channel quality.
13. The user equipment of claim 12 , wherein the reference signal is a channel state information reference signal (CSI-RS) or a common reference signal.
In the radio link monitoring UE using reference signals from the previous description, the reference signal is either a channel state information reference signal (CSI-RS) or a common reference signal. The UE leverages these signals to assess the channel quality for radio link monitoring.
14. The user equipment of claim 8 , wherein the configuration information comprises information on at least one of sizes of frequency ranges, a number of frequency ranges, or positions in frequencies of frequency ranges.
In the radio link monitoring UE from the previous descriptions, the configuration information from the base station includes at least one of the following: the sizes of the frequency ranges, the number of frequency ranges, or the frequency positions of those ranges. This gives the base station control over how the UE performs radio link monitoring across the downlink bandwidth.
Cooperative Patent Classification codes for this invention. Click any code to explore related patents in that topic.
October 26, 2012
June 13, 2017
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